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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5872422206483ac122663d5a9592cd00943a7ab2c8ff9406914bb437b3d1a278' 
  AND token = 'O2WnNuF2MHoqu4J5bTZaJ3ynU/Ecx4FMGA9z2X/8GVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}